Genesis 18:1
Then the LORD appeared to Abraham by the Oaks of Mamre in the heat of the day, while he was sitting at the entrance of his tent.
Berean Standard Bible
And the LORD appeared unto him in the plains of Mamre: and he sat in the tent door in the heat of the day;
The LORD appeared to him by the oaks of Mamre, as he sat in the tent door in the heat of the day.